apt-pkg/contrib/hashsum.cc

   1 // Cryptographic API Base
   2
   3 #include <unistd.h>
   4 #include "hashsum_template.h"
   5
   6 // Summation::AddFD - Add content of file into the checksum             /*{{{*/
   7 // ---------------------------------------------------------------------
   8 /* */
   9 bool SummationImplementation::AddFD(int const Fd, unsigned long Size) {
  10    unsigned char Buf[64 * 64];
  11    int Res = 0;
  12    int ToEOF = (Size == 0);
  13    while (Size != 0 || ToEOF)
  14    {
  15       unsigned n = sizeof(Buf);
  16       if (!ToEOF) n = min(Size,(unsigned long)n);
  17       Res = read(Fd, Buf, n);
  18       if (Res < 0 || (!ToEOF && (unsigned) Res != n)) // error, or short read
  19          return false;
  20       if (ToEOF && Res == 0) // EOF
  21          break;
  22       Size -= Res;
  23       Add(Buf,Res);
  24    }
  25    return true;
  26 }
  27                                                                         /*}}}*/